Window regulator



.Patanted (mi H152? SHLLIE STEM M L. T. SULLEY.

WINBUW REGULATOR.

APPucA ca my: JULY m. i920.

, INVENTOR mmau v L. T. BULLEY.

WINDOW RGULATORi RPPLICUEUN HLED iULY M, T9126, '1A3GJF93. .iatenmd 061; 3,1322.

4 SHEETS SHiET 2.

INVENTOR ATTORNEY L. T. BULLEY.

WINDOW REGULAYOR.

APPLICAHUN man mu 16,1920,

1 iNVEFgTOR am 11x56 (74' TTORNEY Patented Out. 3, 1922.

L. T. BULLEY.

WQNDOW REGULATOR.

AFPLICAHON FiLED luur a, 2920.

1 ,430,793 Patented Oct 3, 192;

INVENTOR 1' ATTORNEY Patented st. 3, 1922.

uu i' rsp- STAT-as PATENT OFFICE.

LOUIS tr. nnnmnioina'wj mm, conn'ncncn'r, ASSIGNOR are c. cownss a; comrun; or new n'nvmt, como ncu'r, A cqmona'rlon or connno'r mu'r.

WINDOW REGULATOR.

Application and m 1a, 1920. semi No. 396,190.

1 '0 all whom it w ntry 0065mm.-

Be it known tl ia=t 1, Louis T. Bonner, a citizen of the United States, residing at New Haven, county of New Haven, State of Connecticut, have merit in 'vvliitlflw Regulators, following is a specification. r

This invention rel tes ,tofwindo-w re ulating mechanism .und has particular re erence to mechanism for 'niunipulnting -slid ing disa )pearing windows, doo.rs, and the like, Sll I for ex'ui'nplc, ey are used on automohile and'railway cars. and the invention has for its general object to furnish improved mccliams l n of thepresent character. To thisend I provide a window regulator of simplified and durable construction which may he manufactured with-but a minimum of expense for the reason that nearly all of the parts may be composed of pressed metal.

A specific object is to provide improved means of-the general type disclosed in Patent No. 1,245,189, granted tome on Novemher 6, 1917, for" prodncin 'lateral movement of the window to cause. itto automatically of which the latch itself in closing and to a-utomatically unlatch itself in openi'n' Another specific object means fonyiel dinglyholding one of the sprockets a inst; theneontinuous lift ing chain of the invention wherein the. chain is properly tensioned to ellie ent y perform its function. are to provide cushioni means whemb the window is prevented ro'm lock' 'witi abang when raised, to. provide. ad uSting means for re ulatin the spring action of the sprockets 0 provide simpleand readily accessible means for disconnect' the win-- dow from the operating mechanism whenever this is desirable, and to .provide ademeans for the control q e a t r l lles mechanism of the windomiegnlatmgmechism of-the invention.

45-"'*With the above and other objects in view,

the invention comprises the construction, arrangement and combination of parts as now to be'fully described and hereinafter specificallyclaimed.

In the accompanying drawing forming a part of this specification,

Fig. 1, an elevation of a window and invented an Improve- Still further specific -objects' frame, showing the window lift mechanism of the invention;

Fi 2 a vertical, sectional view taken substantially through the center of Fig.' 1;

Fig. 3 a detail elevation ofthe window lift mechanism on an enlarged scale;

Fi 4 an elevation as seen from the right in Fig. 3;-

Fig. 5 n detaiLc'entral, sectional view of the operating handle and control mechanism;

Fig. 6 a section on line 7- in Fig. 5-; Fig. 7 a section as on line. 88 in'Fig.-5; Fig. '8 a section on line 9-9 in F i 7; Fig. 9 an enlarged detail view 0? one of the sprockets und'the spring drum;

"fieferring frame with'a window therein. The frame is provided with a pair of opposite channel u1des22 pivoted at their tops to the frame as indicated at 23. 24 denotes a'sliding sash, herein shown as a pane of glass provided with' a bottom beading 25' having a catch 26 which is ada tedto engage. a latch 27 carried by the ire e sill member denoted by 28. Mounted on the other sill member. denoted by 29, is a plate 30 which is adapted to support the operating handle and the control mechanism, a part of the control mechanism being located in sill member 29 and a part projecting outwardly beyond said sill member as more clearly shown indoweled into plate 30 as indicated M32 and secured to said plate by means of rivets 33 to the drawing, 21. denotes a v provides a housing for the part-of the control mechanism extending beyond plate 30. Rivets 33 also secure a ratchet- 34 provided with ratchet teeth 35 to said cupl A hub 36 located in the cup and ratchet and resting against plate 30 rotatahly receives the main shaft, denoted by 37 which passes through plate 30'and by means of which rotary movement is imparted to the part -of the arm of a spring 68. The springs are coiled control mechanism pro'ecting outwardly at their midlengths about pins 69 extending from the sill 'member. The inner end of the fro n the disk, and the opposite end of each main shaft, as clearly shown in Fig. 11, is spring bears against the wall of a depres rigidly secured, its indicated at 38 to a' gear sion 70 in thepawl trippingplate tonor '70 39. A cover 40'is provided, for ge grlllgandl mally hold saidtripping plate in its inoper I rotatably mounted theeovegas indicated' ative position and the pawls in operative at 41 in Figvfi is a'sho, shaft 42 the outer engagement with the. teeth of the ratchet: 'cnd of whigh l s squlk ;t0;,1'ig:ldl :cgrrya en. now-the operating handle interned pinioni 43, wli1gs.9} .osed .=m 1 ig;.j1-1, is in either direction, it will be apparent that 75 adapted to m e s; withge aiz{ 39i Thecoizer pinlonh43 Wlll cause lgear 39 andthe main supports a bracket 44. provided with .a citshaft .tohe rotated. he first elfect of rota cu ar opening-which rotatahly reeeiges'the tion of the main shaft willcause one of hub, de noted by 45, of an operating handle. arms 67 to-engage one of shoulders 71 and) 46,.the inner squared endof the short shait, raise the tri ping plate fromlits'inoperative" so denotedby 47, bein socketefd into thehiih position as s own 1n-F ig 6 to lift the pawls' and a screw 48in; enhub a'nd pha ft insm from the ratchet teeth, and the tripping ing the position-of thehuhzq the .sh nftr A plate will remain in its operative position flat spring 49 redlo-thercoveruatbo and so, long as the main shaft is bein -;rotated-,

b arin against; e and th v, tinged the. relative [sizes of opening 64 an the-head as,

portion :the shmsheft ndioa at 51 of the main shaft being such that the oppm 1 provides antifif ttlinggnie a -folglihg 'gglufjnd sltely extending arms can; not comlefiefly' plmon as. wi i,be. uiide'rstood.., 52 denote turn over in said openm Continue "rotaa disk which is loosely-mounted fllt illlgb 36 tionof the m'ainsha I; will rotate the and oaiti'oned in the, but) member sprocket, the force being applied throuh3g0 just beyond the ratchet. This, 'iskjis, pros t 1e tripping plate. and pins- 6 1 aslwillzhe' vided with ,phwlgfifl haying inwapdlye obvious. The instant the operating handle tending lugs which through a cut is released, springs 68 willreturn the tripaway portion ofthegdislrfxjzbteg Mand ar p n plate to its inoperative position and adepted to engage .theteeth of ,theratehet. wll cause thegawls to engage opposite sides 95 Encircling the (cup shaped .rnen hergia ,a of a tooth of t e ratchet to lock t e sprocket sprocket eonsistingof -twometat In an desired position. a members deiiotedby 56 andT-fi ,"respectively, 72 enotes a horizontally disposed frame which are secured to each other as indicated member secured too-the lower portion of the as at 58, and the outer perihery of the cup w nd w tr in s indic ted at shaped; men be as showngth!) vno'tesian upright frame member which extoprovide together with ,=the-two members tends betweenplate 30 and-fran1e member 72,

of thesproelretl-a raceway for ballsfiO; for the .upright gframe-member be secured to an. obvious purpose 56 .of the-l ete'ilfl'as indicated at 75 and to-"rame meni-v aproolr'et-teian'; mot-the haseefithe; '1; 72:8-fillldll3fll6d at 76;

- a v :106 ca niemheeimmanen Acarrymg latef'l'm for the purpose of when portion ef uepe tme n rg r r k el '.-fil llbl l,.tbge tller the sprocket he 1 52" f fore' -.desembed,. can'iesthe continuousdqilflllftl'ng del 1 a saiddihkscrew 81 passes-through said plate, drum d m 1m space hem-,Yfrem each and sprocket and is rovided with'alockin'g other. 63 denotes-a longitudinally movable nut 82 which holds t ese parts to each other;

pawl tri ing plate -whieh is provided with 83 denotes: a flat. spiral 8 ring one end of 115 arelativ largeropening 64and withradial which is secured to the rum as indicated slots 65, the opening-. ;l)eing adapted to re at. 84 and the other end'of which is secumd oeive thehead,,- denoted by 66', of the main, to the largerspmcket as indicated M85, and shaft, and the radial slots adapted. to-slidthe drum and sprocket are arranged with 3 and 74 de- 100.

tedvbyso. As 11 0- imlnsedin F1gr-10,"a headed ably receive the-enlarged portions of pins respect to each other to provide a race way 2 61 whereb longitydinal movement of the for balls 86. The larger sprocket is ada. I trippingg The head of the, toturn on screw 81 asa pivot pointjand the n ain she-. own in Figs (:3, drlunis adapted to be adjustabl lfi dly 1's prefers? i seid shafit end is, to thecarrying plate so that the flat 6) provided {in 'Ho posnely extending Lei-inst}? spiral spring winds and unwinds as't-he 155 which are adapted to engage shoulders 71 sprocket is turned on its axis, the arrangein the tripping plate in a manner presently ment here being for the spring to wind as to be described. Pawls 53 are pivoted 'to the window is being lowered, that is, opened. disk 52 at approximatellv their mid-length 87 denotes a housing for the flat spiral and the tail of each paw is engaged by one spring. The adjustment between the drum and the carrying plate therefor is for the purpose of regulating the spring action ot the larger sprocket, will be understoml. The carrying plate is recessed to receive a short tubular member 88 in which is positioned a spring pressed pin $411 provided with a collar 90, and the drum is provided with a series of perforations 91 adapted to receive the pin, the collar. as will be obvious from Fig. 12, being for the purpose of limiting the inward movement of the pin. Screw 81 provided with a squared. portion $.12 which is arran ed to engage a corresponding open ing in drum, and the end of the screw which extends beyond the locking nut is also squared as shown at 93. To revolve, the drum to regulate the spring action of the fiat spiral spring, all that is necessary is to pull on the spring pressed pin until it is released from the drum to then cause squared end 93 of screw 81 to be turned in the desired direction, and to then release the pin so that it enters one of the perforations in the drum, it being understood that the larger sprocket will be held in stationary position by the continuous lifting chain While the adjustment is being made.

Carryin plate 77 is eccentrically pivoted to the upright frame member as indicated at 94. A hook bracket 95 carried by said upri ht member has secured to it one end 96 o a coil spring the other end of which is attached to the carrying plate as indicated at 97. It will be apparent that the coil spring is for the purpose of causing the larger sprocket to be yieldingly held against the continuous lifting chain to cause the chain to he at all times under the proper tension for its purpose. Pins 98 extending from the frame members and engaging arcuate slots 99 in the carrying plate are for the purpose of limiting the movement of the carry ing plate.

The bottom heading of the sliding sash has secured to it a window carrying plate 100 which in turn is adapted to be detachably connected to a )late 101 supported from the continuous lifting chain. As shown more clearly in Figs. 7 and 8, plate 101 is provided with ayonet slots 102 and with a straight slot 103 which is positioned between the bayonet slots, and the window carrying plate is provided with forwardly projecting pins 104 adapted to enter the bayonet slots and a locking lever 105 mounted in the window carrying plate is provided with an eccentrically positioned pm 106 adapted to enter the straight slot in plate 101. Lugs 107 are for the purpose of limiting the downward move ment of the locking lever. It will be cvident that to fasten the window carrying plate to plate 101, pins 104 are tiist passed into the bayonet slots and the locking lever is next moved to the position in which it is shown in Fig. 7. the eecentrieally r anged pin. in the meantime, causing pins 104 to move into the otl'sct portions of the bayonct slots. l'o disconnect the plates, the lover is swung in clockwise direction from the position shown in Fig. 7, as will be understooi'l.

Plate 101 is provided with an elongated slot 108 for the purposc now to be explained. A sliding block 100 arranged on one side of the elongated slot is riveted to a tubular canl 110. arranged on the opposite side of said slot. the block and tubular cam being movahie as a unit longitudinally of said slot. A preferably triangular plate 111. securely fixed to one of the links ol the continuous lifting chain. as denoted at 1152. has rigidly secured thereto and projecting therefrom a relatively large pin 113 which passes through a hole in the sliding block and enters the tubular can] as. more clearly shown in Fig. 8. A rclativcly small. pin 111 adapted to travel in a cam slot 115 in the tubular cam is fixedly secured to the relatively large pin as more clearly dis closed at in Fig. h. 11? denotes a closure cap in the tubular cam. \Vhen now the window lilting chain is caused to he moved in the direction of the arrow in Fig. 7, and the portion of the chain which carries the triangular plate commences to move from right to left in said figure. it will be obvious that the relatively large pin will be caused to turn in a counter-clockwise direction. This turning movement of the relatively large pin will force the relatively small pin to ride in the cam slot. which, as sug gested in Figs. +1 and H. is of a configuration to cause plate 101 to move outwardly on the relatively large pin. This outward movement will continue until the triangular date and consequently the sash has rea hed its highest elevation. and the catch carried by the heading is positioned directly over the latch carried by one of the sills. As the triangular plate moves from its highest elevation to the position shown in Fig. 7. the sash will be lowered so that the catch will engage thc latch as it is shown in Fig. H. the portion oi the cam slot through which the relatively small pin passes dur iug this movement being straight. When the lifting chain is moved in the opposite direction to lower the window. the catch will first be lil'tcd from the latch and the cam slot will cause plate 101 to move inwardly on the relatively large pin, as will be obvious.

Plate 101 is provided with a second elongated slot 118 which is parallel with elongated slot 10H.v Slidably arranged in the second elongated slot is a cushion block 119 provided with a. shoulder portion 120. A spring 121 secured to the cushion block as indicated at 122 and to plate 101 as indirated at 123 normally holds the cushion block in the "right hand end of the second elongated slot as it is shown in Fig. 3. The sliding block in elongated slot 108 is provided with a shoulder portion 124 adapted to bear against the shoulder portion of the cushion block when said sliding block moves from right to left as suggested in Figs. 3 and T. It will be apparent that the cushion block is mowd from right to left against the action of spring 121, and provides means for preventing the sliding sash from locking with a bang when raised. It will further be apparent that the cushion block will assist the sliding block in its moven'ient toward the right fromthe position shown in Fig. 7 when it is desired to release the catch from the latch to lower the sliding sash.

Assuming that the sliding sash is in its raised position and the window is closed, all that is necessary to lower the sash to open the window is to turn the operating handle in a countcr-clockwise direction. This causes the gear which meshes with the pinion actuated by the operating handle. as well as the main shaft and the control mechanism, to be rotated in a clockwise direction. To elevate the sliding sash, the operating handle is turned clockwise.

\Vhat I claim is:

1. In a control mechanism of the class described a main shaft by which the control mechanism is actuated, a gear rigidly sccured to the main shaft, a pinion adapted to mesh with the gear. a. short shaft by which the pinion is carried, an autirattling spring bearing against the short shaft and pinion, and an operating handle for rotating the short shaft.

2. In a control mechanism of the class described a main shaft by which the control mechanism is actuated, a gear rigidly secured to the main shaft, a pinion adapted to mesh with the gear, a short shaft by which the pinion is carried, a. cover for the gear and pinion, an antirattling spring secured to t is cover and bearing against the pinion and short shaft. and an operating handle for rotating the short shaft.

3. In a mechanism of the character described, a window carrying plate provided with a slot, a sliding block arranged in said slot, and a tubular cam riveted to said block and provided with a cam slot, said block and ubu ar cam arranged on opposite sides of said plate, in combination with a lifting chain, a plate secured thereto, a relatively large pin rigidly carried by'said last mentioned plate and adapted to pass through said block and slot and to enter said tubular cam, and a relatively small pin rigidly secured to the relatively large pin and adapted to ride in said cam slot.

4. In a mechanism of the character described, a window carrying plate provided with a slot, a sliding block arranged in said slot, and a tubular cam riveted to said block and provided with a cam slot, said block and tubular cam arranged on opposite sides of said plate and adapted to travel in unison. in combination with a lifting chain, a preferably triangular plate secured thereto, a relatively large pin rigidly carried by said triangular plate and adapted to pass through said block and slot and to small pin rigidly secured to the relatively large pin and adapted to ride in said cam slot.

5. In a mechanism of the character described, a window carrying plate provided with a slot, a sliding block arranged in said slot, and a tubular cam riveted to said block and provided with a cam slot, said block and tubular cam arranged on opposite sides of said plate and adapted to travel in unison in said slot, in combination with a pair of sprockets, a continuous lifting chain, carried thereby, a preferably triangular cured to said lifting chain, a relatively large pin rigidly carried by said triangular plate and adapted to enter said tubular cam, and a relatively small pin secured to the relatively large pin and adapted to ride in said cam slot, whereby when said lifting chain is elevated and said triangular plate is moved transversely of said sprockets, the relatively large pin is turned to force the relatively small pin to ride in the cam slot and thereby cause the window lifting plate to move outwardly on the relatively large pin for the purpose specified.

(i. In a mechanism of the character described, a window carrying plate provided with a slot, a sliding block arranged in said slot. and a tubular cam secured to said block 05 and provided with a cam slot, said block and tubular cam arranged on opposite sides of said window carrying plate, in combination with a pair of sprockets and means for causing one of said sprockets to-be rotated, a continuous lifting chain carried by said sprockets and adapted to be actuated thereby, a preferably triangular plate secured to the lifting chain, a relatively large pin rigidly carried by said triangular plate and passing through said sliding block and entering said tubular cam, anti a relatively small pin secured to said relatively lar pin and adapted to ride in said cam slot.

11 a mechanism of the character described, a window carrying plate provided with a slot, a sliding block arranged in said slot, and a tubular cam secured to said block and provided with a cam slot, said block and tubular cam arranged on opposite sides of said window carrying plate, in oombination with a pair of sprockets and means for causing one of said sprockets to be rotated, a continuous lifting chain carried by said sprockets and adapted to be actuated thereby, a relatively large pin supported from said continuous lifting chain and adapted to be given a turn when said chain is moved to a position so that said relatively large pin travels transversely of said sprockets. and a relatively small pin secured to said relatively large pin and adapted to ride in said cam slot to cause said window carrying plate to more longitudinally of said relatively large pin.

8. In a mechanism of the character described. a window carrying plate provided with a slot, a sliding block arranged in said slot. and a tubular cam secured to said sliding block and. provided with a cam slot, said block and tubular cam arranged on opposite sides of said window carrying plate. in combination with a lifting chain. a relatively large pin supported from said lifting chain and adapted to be given a turn by said chain. and a relatively small pin secured to said relatively large pin and adapted to ride in said cam slot. whereby said window carrying plate is adapted to move longitudinally oi said relatively large pin.

9. In a mechanism of the c iaracter described. a window carrying plate provided with a slot. a sliding block arranged in said slot and provided with an opening. and a tubular cam secured to said sliding block and provided with a cam slot. said block and tubular cam arranged on opposite sides of said window carrying plate. in combination with a lifting chain. a relatively large pin upported from the lifting chain and pass ing through the opening in the sliding block and adapted to he iven a turn in either direction by said c ain. and a relatively small pin secured to said relatively large pin and adapted to ride in said cam slot to cause said window carrying plate to move longitudinally of said relatively large pin.

10. In a mechanism of the character described. a window carrying plate provided with a slot. a sliding block arranged in said slot, and a tubular camsecured to said sliding block and provided with a cam slot. in combination with a lifting chain. a relatively large pin supported therefrom. and w-relatively small pin secured to said relatively large pin and adapted to ride in said cam slot.

11. in a mechanism of the character de scribed. a window carrying plate-provided with a pair of longitudinal slots. a sliding lilock arranged in one of said slots and a tubular cam securml to said sliding block and provided with a cam slot. a cushion block arranged in the other oi said slots and a spring by which said cushion block is tensioned, said sliding illflllx' and cushion block provided with correi-sponding shoulders adapted to engage each other. in. combination with a. litting chain. a relatively large pin supported therefrom. and a rela tively small pin secured to said relatiiely large pin and adapted to ride in said cam slot. i

12. in a mechanism of the character described. a window carrying plate provided with a pair of longitudinal slots. a sliding block arranged in one of said slots and a tubular cam secured to said sliding block and provided with a cam slot. a cushion block arranged in the other of said slots and a spring by which said cushion block is tensioned. said sliding block and cushion loloek provided with cm'responding shoulders adapted to engage each other. in combination with a lifting chain. a relatively large pin supported from the lifting chain and adapted to be given :1 turn in either direo tion by said chain. and a relatively small pin secured to said relatively large pin and adapted to ride in said cam slot to causc said window carrying plate to mov longitudinally of said relatively large pin.

13. in a mechanism of the character dc scribed. a window carrying plntc provided with a pair of parallel slots. a sliding ldln'lt arranged in one of said slots and a tubular cam secured to said sliding block and provided with a cam slot. and cushioning means arranged to slide in the other of said slots. said sliding block and cushioning means provided with corresponding shoulders. in com-- bination with a pair of sprockets and means for causing one of said sproclv'cts to be ro tated. a continuous lifting chain arried by said spro kets anduadapted to be actuated thereby. a relatively large pin supported from said continuous lifting chain and adapted to be given a turn when said chain is moved to a position so that said relatively large pin travels transversely of said sprockets. and a relatively small pin secured to said relatively large pin and adapted to ride in said cam slot to cause said. window carrying plate to move longitudinally of said relatively large pin. and said shoulder on said sliding block adapted to bear against said shoulder on said cushioning means while said relatively large pin is moving transversely ot said sprockets.

14-. in a mechanism of the character described. 2} window sill provided with a latch. a sliding sash provided with a catch. a carryng plate secured to the sliding sash and provided with a slot. a sliding block and a tulnrlar cam arranged in said slot said tubular an: provided with a cam slot. in comhination with a lilting chain. a relatively large pin supported therefrom. and a relatively small pin imbedded in the relatively large pin and adapted to ride in the cam slot. whcrchy said carrying plate is movable longitudinally on said relativdly large pin to cause said catch to engage said latch or to be released therefrom.

H3. in a mechanism of the. character d till ll ll Hill scribed. a window sill provided with a latch, a sliding sash provided with a catch. a carrying plate secured to the sliding sash and pro vided with a, slot. a sliding block arranged in said slot a tubular cam secured to said sliding rock and provided with a cam slot, said block and tubular cam arranged on opposite sides of said carrying plates. in combination with a lifting chain. a relatively large pin supported therefrom and adapted to pass through the sliding block and to enter the tubular cam. and a relatively small pin secured to the relatively large pin and adapted to ride in the cam slot. whereby said carrying plate is movable lUIlgitlttlltllllY on said relatively large pin to cause said catch to engage said latch or to be released there from.

16. In a mechanism of the character described. a window sill provided with a latch, a sliding sash provided with a catch. a carrying plate secured to the sliding sash and provided with a slot. a sliding block arranged in said slot. a tubular cam secured to said sliding block and provided with a can] Slot. said block and tubular can] arranged on opposite sides of said carrying plate. in combination with a pair of sprockets and means or causing one of said st'n'ockets to be rotated. a continuous lifting chain carried by said sprockets and adapted to ie actuated thereby. a preferably triangular plate secured to the lifting chain. a relatively large pin rigidly carried by said triangu ar plate and passing through said sliding block and entering said tubular cam. and a relatively small pin secured to said relatively large pin and adapted to ride in said ram slot.

17. In a mechanism of tlle character described. a window sill provided with a latch. a sliding sash provided with a catch. a can rying plate secured to the sliding sash and -provided with a slot. a sliding block arranged in said slot. a tubular cam secured to said sliding block and provided with a cam slot, said block and tubular cam arranged on opposite sides of said carrying plate. in combination with a pair of sprockets and means for causing one of'said s rockets to be rotated. a continuous lifting cliain carried by said sprockets and adapted to be actuated thereby. a relatively large pin supported from said continuous lifting chain and adapted to be given a turn when said chain is moved to a position so that said relatively large pin travels transversely of said sprockets. and a relatively small pin secured to said relatively large pin and adapted to ride in said cam slot to cause said window carnving plate to move. longitudinally of said relatively large pin, whereby said catch may be made to engage said latch or to be released therefrom.

18. In a mechanism of the character described. a pair of sprockets one of which is mounted on an eccentrically pivoted support. a continuous lifting chain carried by said sprockets. and means associated with said ectentrically pivoted support whereby said sprocket may be yieldingly held against said chain.

19. In a mechanism of the character described, a pair of sprockets one of which is U pivoted support, a continuous lit'ting chain carried by said sprockets. ,and means associated with said cccentrically pivoted support whereby said sprocket may be yieldingl held against said chain, said secured to a support and to said eccentrically pivoted su ort.

2 n a mechanism of the character described. a carrying plate, a drum and a sprocket. means for holding said drum and sprocket to each other and to the carryin plate, a spiral spring arranged between said drum and sprocket and having its opposite ends connected to said drum and sprocket, respectively. and means whereby said drum may be adjustably secured to said carryin plate comprising a series of openin s in to cooperate with said openings to hold the drum in adjusted position. a

l. n a mechanism of the character described, a carrying plate, a sprocket rotatably adapted to rotate with respect to each other, a spiral spring arranged between said drum and sprocket and adapted to supply said sprocket with a spring action, and means for adjnstably securing said drum to said carrying plate, said means comprising a spring pressed pin 7 adapted to enter any one of a number of perforations in said drum.

22. In a n'iechanism of the character described. a window carrying plate and a )late dctachably secured thereto, one of said p lates provided with bayonet slots and with a straight slot between the bayonet slots, and the other of said plates provided with pins adapted to engage the bayonet slots and with a locking lever equipped With an eccentrieally positioned pm adapted to enter said straight slot.

ln testimony whereof I atfix my signature.

LOUIS T. BULLE Y. 

